目前比較常用的枚舉

public enum Planet {
    MERCURY(3.302e+23, 2.439e6),
    VENUS  (4.869e+24, 6.052e6),
    URANUS (8.683e+25, 2.556e7);

    private final double mercury;
    private final double venus;

    Planet(double mercury, double venus) {
        this.mercury = mercury;
        this.venus = venus;
    }
}

這種方式較爲常見。

        for (Planet planet : Planet.values()) {
            double mercury = planet.mercury;
        }

 

来源：https://www.cnblogs.com/CherryTab/p/11884749.html